here's a nice 300A continous low rds MOSFET. Package would require some tricks to fit. Not expensive too. Avalanche rating much better than with irfp4110. Any drawbacks?
https://www.infineon.com/dgdl/Infineon-IPT015N10N5-DS-v02_02-EN.pdf?fileId=5546d4624a75e5f1014ac94680661aff
https://www.infineon.com/cms/en/product/packages/PG-HSOF/PG-HSOF-8-1/#!products
https://www.infineon.com/dgdl/Infineon-IPT015N10N5-DS-v02_02-EN.pdf?fileId=5546d4624a75e5f1014ac94680661aff
https://www.infineon.com/cms/en/product/packages/PG-HSOF/PG-HSOF-8-1/#!products